Steam-generator



(No Model.)

J. W. S'IEVENS. v

STEAM GENERATOR.

X) MENEM Patented Deo. 4, 1888.

N. Firms, Phnmmgmpner. wunmmm D. a

UNITED STATES PATENT OFFICE.

JOHN IVALTER STEVENS, OF ST. PAUL, MINNESOTA.

sTEAM-GENl-:RATOR SPECIFICATION forming part of Letters Patent No. 393,864, dated December 4, 1888.

l Applcationvled March l2, 1888. Serial No. 266,932. (No model.)

To all whom it may concern.-

a citizen of the vU nited States, residing at St.

Paul, in the county of Ramsey and State of 5 Minnesota, have invented certain new and i useful Improvements in Steam-Generators, of which the following is a specification.

This invention relates to steam-generators;

out in the claim.

In the drawings, Figure l is a front elevation, Fig. 2 is a side elevation, and Fig. 3 is a plan view on the line Z Z of Fig. 1, of the furnace without its inclosing casing or shell, Figs. l and 2 being partially in section. Fig. 4 is a side elevation, Fig. 5 is a plan view, and Fig. 6 is a cross-sectional view on the line Y Y of Fig. 4, of one of the sections of the generator enlarged. Fig. 7 is a plan view of the fire-pot detached. Y

A represents the iire-pot, which is formed with hollow walls to contain water and B, the steamfdome, the dome and fire-pot being connected by a series of short cylindrical sections, D, and piping. E E2, the whole firmly fastened together by tie-rods F, passing down through the elbows E3 of the piping, thence through the sections D, and thence through the fire-pot, the ends of the rods being supplied with nuts a, by which the parts may be drawn tightly together. There will be as many series of these cylindrical sections as may be required, and the generator may be constructed, therefore, of `any height by simply using a greater or less nu `iber of the sections. Each adjacent pair of t e sections D is connected by a cross-tube, D and each opposite pair of these cross-tubes are connected by inclined tubes or pipes G, as shown.

Intermediate sections, D2, are shown formed in the cross-tubes D at their centers, so as to connect all the cross-tubes of each side together, and they are also connected to the dome B by pipe-connections E4, tie-rods E l passing down through these intermediate sections in the same manner as through the corner-sections D, except that the intermediate sections are not connected to the fire-pot, but with the lower sect-ions closed at their lower ends, except a hole for the rods E.

The pipe-connections E between the sections D and the fire-pot on the rear side of the generator are shorter than the connections E on the front sections, so that the rear sections commence at a lower point than the front sections, to cause the connecting-tubes G to stand at an angle, as shown, to secure the necessary l f drainage of the system of piping and other and it consists in the construction, combina- I tion, and arrangement of parts, as hereinafter shown and described, and specically pointed parts and insure a complete and rapid circulation of the water.

The inclined tubes G are arranged yalternately, as shown in Fig. l, so that onei horizontal line of tubes come above the spaces between the line below them. By this means the fire and products of the combustion are compelled to take a zigzag course among the tubes, thereby insuring a more complete contact of the heat with the tubes andthe more economic use of the heat generated in the fire-pot. Another great advantage of this arrangement of the tubes is, that they are directly above the fire in the fire-pot, thereby receiving the full beneiit of all the heat which arises therefrom.

By arranging the sections D D horizontally I am enabled to set the tubes G in the alternating or zigzag' positions shown, and leave all parts open, so as to be entirely surrounded by the flame and heat. By this construction the water is retained in small compartments, which are entirely surrounded by the iire and heat, thereby greatly increasing the heating surface without increasing the size or expense of 'the generator, and insuring a very rapid and free generation of the steam, and with great economy in the use of fuel, as all the heat rising from the iire-pot is utilized.

Beneath the tire-pot A, opposite the sections D on the rear side of the generator, are pipeconnections E5 and elbows EG, the rods F on that sidebeing continued downward through these connections, as shown, so as to bind the whole firmly together. To one of these branches E5 E6 the return-piping is connected, while the other will be utilized as a means for blowing off the water fromv the IOO paeking,) so as to insure a water-tight connection between the parts.y

In large generators two or more series of the intermediate sections, D?, mightbe employed, and in small generators the intermediate sections might be dispensed with, as the dist-ance between the cornersections would not be great enough to require it; but generally the construction shown will be the one employed.

Any suitable form ot' shell or easingmay be employed to inclose the tubing and sections; but as the easing t'orms no necessary part ot the present invention I have not shown it in the drawings.

The sections D and their connecting-tubes l')' will generally be formed ot' castiron,\\'hile the tubes G and dome B will be ot' ordinary wrought-iron or steel pipin The fire-pot A will generally be ot cast-iron, but may be ot wrought-iron or steel, it' pret'erred.

The opposite sections, D' D', and their eonnecting-tubes G might be in one piece oi' eistiron 0r steel; but generally they will be construeted as shown.

The dome B will preferably be formed, as

ternately-arranged inclined tubes (i, connectbefore stated, of a section of wrought-iron or steel tubing,with screw-caps B' forming the ends, this construction insuring a very strong, cheap, and convenient dome peculiarly adapted to a generator of the class shown.

By this construction I produce a generator which can be manufactured at a comparatively small expense, and, being made of small parts, any part ean be easily replaced when broken or burned out.

Another great advantage ot the construeboxes or shipped separately,it required. The i construction also forms a complete sectional generator, thus insuring safety from explosions, as there is no opportunity for the accumulation ot` any large quantity ot' steam at any one point.

Having thus described my invention, what I claim as new is- In a sectional steam-generator, the combination ot' the lire-pot A, the steam-dome l, the cross-tubes D', having the vertical end sections, D, and central sections, Dt, the pipesections E', connecting the tire-pot with the lower end sections, the upper pipe-connections, E2, E, and E", connecting said vertical seetions l) and I.)`- to the steam-dome, and thealing said cross-tubes l)', substantially as described.

In testimony whereof l have hereunto set my hand in the presence of two subscribing` witnesses.

J. lVAL'lER STEVENS.

Witnesses:

0. I). Wuninam, C. N. WooDwARD. 

